New Speaief< of Fos.yils fruni Ohio. 233 



APPENDIX. 



Leiorhynchus Sewberryi. 



Leioriiynchus Newberbyi, H. & W., 28d Rept. State Cab., N. Y. Iq 

 the description of this species it is correctly referred to the Chemung- group, 

 but improperly to the Waverley group on the plate. 



Genus Pholadella, H. & W. 



Preliminary notice of Lamellibranchiate Shells of the Upi^er Helderberg, 

 Hamilton and Chemung groups, etc. (State Cab. Nat. Hist., Decern., 1869, 

 p. 63). The name ("Hall, n. g.") incorrectly inserted without my know- 

 ledge.— R. P. W. 



Pholadella ^iTeii^berryi. 



Pholadella, Newberryi, H. & W. Prelim. Notice, cited above, p. 

 65. Allorisma (Sedgwickia ?) pleuropisiha, Meek ; Pal. Ohio, Vol. I, p. 309, 

 Plate 13, 

 Figs. 4a and #. 



Pleurotoinaria ]91i§si$sippieiisis. 



Pleurotomaria Mississippiensis, White & Whitf., Proc. Bost. Soc. 

 Nat. Hist., 1862, p. 203, Vol. 8. 



Pleurotomaria textiligera. Meek ; Pal. Ohio, Vol. I, p. 314, PL 13, Figs. 

 la and h. 



Note on the Marcellus Shale and other Members of the 

 Hamilton Group in Ohio, as determined from Palaeontologi- 

 cal Evidence. 



During the early summer of 1878, Pres't Edward Orton wrote, 

 asking if I could spend a few days with him in central and 

 southern Ohio, in an effort to ascertain from palgeontological 

 eyidence, the true horizon of certain hiyers of rock which had 

 been somewliat of a difficulty to him; and in the month of August 

 I spent several days with him for that purpose. While making 



